Hi, I have a 1998 Caravan with a 3.0 engine and have a problem with a Injector Circuit Malfuntion trouble code on only 1 injector. I have replaced the injector and checked all wiring and connectors. I used a noid light on the driver output from the PCM and dicovered that the light did not flash for the injector that I have the code for. So I assume I have PCM thats not sending a signal to the injector. Can I also assume that the PCM is the problem or can something else cause this problem? If it is the PCM, could getting it reprogrammed solve the problem or do I have to repace it? Thanks for any help anyone can offer.

 

I would ohm test the injector wire to make sure you don't have a open or shorted wire.

 

Yes i did that already. I check resistance from the connector to the injectors and from the connector back to the PCM. There are no shorts or no opens from the PCM connector to the injector. So if there is no signal coming from that one injector driver does that mean the PCM is bad?

 

Thats correct. You may have a bad driver in the PCM.

 

Thank you

 

I have seen several injector drivers go bad by bad injectors....So now off to replace the ecm.....

 

I have the same problem with an '02 caravan. Found battery voltage at PCM pin. Whats up with that ?